U.S. patent number 3,817,416 [Application Number 05/277,397] was granted by the patent office on 1974-06-18 for safety closure cap for containers.
Invention is credited to Allan Costa.
United States Patent |
3,817,416 |
Costa |
June 18, 1974 |
SAFETY CLOSURE CAP FOR CONTAINERS
Abstract
There is disclosed a safety container closure attachable to the
neck of a container or to a tubular base secured to the container.
The safety closure comprises a screw cap which can be screwed off
or on and constitutes the closure proper and a cover cap rotatably
fitted upon the screw cap completely overlying the screw cap to
prevent direct access to the same. The cover cap is normally biased
into a position spaced apart from the screw cap so that rotation of
the cover cap has no effect on the screw cap but can be axially
depressed into a position in which it is coupled to the screw cap.
With the cover cap in this coupling position, rotation of the cover
cap causes rotation of the screw cap also thereby permitting
opening or closing of the container.
Inventors: |
Costa; Allan (West Islip, Long
Island, NY) |
Family
ID: |
23060686 |
Appl.
No.: |
05/277,397 |
Filed: |
August 2, 1972 |
Current U.S.
Class: |
215/213; 215/220;
222/153.07 |
Current CPC
Class: |
B65D
47/122 (20130101); B65D 55/089 (20130101); B65D
50/041 (20130101) |
Current International
Class: |
B65D
47/12 (20060101); B65D 50/00 (20060101); B65D
55/08 (20060101); B65D 50/04 (20060101); B65D
55/02 (20060101); A61j 001/00 (); B65d
055/02 () |
Field of
Search: |
;215/9,46A ;222/153 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Hall; George T.
Attorney, Agent or Firm: Hane, Baxley & Spiecens
Claims
What is claimed is:
1. A closure device for selectively opening and closing a
container, said device comprising in combination:
a tubular inlet and outlet member secured at one end on the
container to be opened or closed;
a screw cap screwable off and on the other end of said member for
opening or closing said other end;
a cover cap rotatably fitted upon said screw cap; and
coacting coupling means on the screw cap and the cover cap, said
cover cap being axially displaceable into and out of a position of
engagement of said coupling means;
said cover cap being rotatable relative to said screw cap when the
coupling means are disengaged and being rotatable in unison with
the screw cap upon displacement of the cover cap into the axial
position in which the coupling means are engaged to effect screwing
off or on of the screw cap.
2. The closure device according to claim 1 wherein said cover cap
covers the screw cap substantially completely to prevent direct
access from the outside to the screww cap.
3. The closure device according to claim 1 wherein retaining means
are provided on the cover cap and on the screw cap to prevent
separation of the two caps.
4. The closure device according to claim 3 wherein said retaining
means comprise a protrusion on an inner sidewall portion of the
cover cap and a coacting protrusion on the outside of the sidewall
of the screw cap, said protrusion on the cover cap underlying the
protrusion on the screw cap thereby preventing pulling off of the
cover cap.
5. The closure device according to claim 4 wherein said protrusion
on the cover cap is in the form of an annular rib underlying the
rim of the sidewall of the screw cap.
6. The closure device according to claim 1 wherein said coupling
means comprise protruding ribs and complementary grooves on the
inside and the outside of the cover cap and the screw cap
respectively.
7. The closure device according to claim 1 and further comprising
yieldable means interposed between said caps, said yieldable means
biasing the two caps into a spaced-apart position in which said
coupling means are disengaged and being arranged to yield for axial
displacement of the cover cap into the position in which the
coupling means are engaged by applying pressure to the outside of
the bottom wall of the cover cap.
8. The closure device according to claim 7 wherein said yieldable
means comprise at least one elastic member on the inside of the
bottom wall of the cover cap and at least one elastic member on the
outside of the bottom wall of the screw cap.
9. The closure cap according to claim 8 wherein the elastic members
on the caps are integral with the respective bottom wall.
10. The closure device according to claim 8 wherein the elastic
member on the cover cap is in the form of at least one slotted ring
and the elastic member on the screw cap is in the form of a
disc-shaped protrusion disposed opposite to said ring for coaction
therewith.
11. The closure device according to claim 1 wherein said tubular
member constitutes a neck part of the container.
12. The closure device according to claim 1 wherein said tubular
member comprises a base part rigidly attachable to the container,
said base part having external threads and said screw cap having on
its sidewall internal threads engageable with the threads on the
base part for screwing the screw cap to the base part.
13. The closure device according to claim 12 wherein said base part
comprises an upper portion having thereon said external threads and
a lower portion having in its rim an annular groove defining two
shanks, said shanks being fittable upon the rim of a neck part of a
container.
14. The closure device according to claim 13 and comprising a
container with a neck part thereon, and wherein at least one of
said shanks has on its inside a protrusion, and wherein the neck
part of the container has an outwardly extending protrusion
engageable with said protrusion on the shank in overlying
relationship for locking the base part to the neck part of the
container.
15. The closure device according to claim 14 wherein said neck part
has adjacent to its rim an outwardly protruding annular rib, and
wherein the inner shank defining the groove in the base part is of
a length such that it extends past said rib and has on its inner
side an inwardly protruding annular rib underlying said rib on the
neck part when the base part is fitted upon he neck part.
16. The closure device according to claim 1 wherein the cover cap
has on the inside of its sidewall protrusions and the screw cap has
on the outside of its sidewall protrusions, said protrusions being
disposed and shaped to coact with each other when the cover cap is
in the position in which the coupling means are disengaged for
rotating the cover cap for unison with the screw cap in the
direction for screwing the screw cap tightly upon the tubular
member and for sliding relative to each other upon rotation of the
cover cap in the direction for unscrewing the screw cap from said
tubular member.
17. The closure device according to claim 1 wherein a tear-off
strip is interposed between the cover cap and the screw cap so as
to prevent prior to removal of the tear-off strip axial
displacement of the cover cap into the position in which the
coupling means are engaged.
18. The closure device according to claim 17 wherein said tear-off
strip encompasses the caps and is along one of its circumferential
edges tearably secured to the cover cap the other circumferential
edge against the tubular member for preventing axial displacements
of the cover cap relative to the screw cap.
19. The closure device according to claim 17 wherein said tear-off
strip has along said other edge a plurality of protrusions and
wherein said tubular member has on its outside recesses engageable
with said protrusions on the tear-off strip.
20. The closure device according to claim 18 wherein said tear-off
strip and said cover cap are circumferentially secured to each
other by a tearable bridge between said cap and the tear-off
strip.
21. The closure device according to claim 1 wherein the outside of
the sidewall of the cover cap is roughened to facilitate gripping
of the cover cap.
Description
The invention relates to a safety container closure cap, which
includes a screw cap screwable on the neck of the container, or
into a base part secured to the neck.
BACKGROUND
With container closures of this kind as now known, the screw cap is
directly accessible to the user of the container and is generally
screwed off by turning it in counterclockwise direction and screwed
on by turning it in clockwise direction.
Such simple mechanisms entail danger that even young children are
able to open the container closure and thus obtain access to the
content thereof. This may result in injuries and even poisoning of
children.
THE INVENTION
It is an object of the invention to provide a container closure cap
such that it can be screwed off and on whenever desired, but that
in particular the screwing off is not possible by simply turning a
cap accessible from the outside but that a combination of
manipulative steps is required whereby the danger of opening of the
container closure by children is very much reduced.
Another more specific object of the invention is that for opening
and reclosing of the container no additional devices such as
special tools are required.
SUMMARY OF THE INVENTION
The objects of the invention are obtained by providing a container
closure of the kind hereinbefore referred to, the screw cap of
which can be turned only when moved into coupling engagement with
an axially displaceable cover cap accessible from the outside and
overlying the screw cap. As a result of this arrangement, screwing
off and on the container closure requires that simultaneously with
the turning of the cover cap in axial displacement of this cap is
effected. Such displacement couples the cover cap with the screw
cap, thereby transferring the rotational movement of the cover cap
to the screw cap itself.
The invention also provides that only the cover cap which
completely covers the screw cap, is accessible to the grip of the
user; in other words, a direct access to the screw cap which
requires a rotational movement is prevented. In this manner, it is
assured that only by simultaneous axial and rotational movement of
the cover cap operation of the actual closure component as
represented by the screw cap is made possible. The likelihood of
simultaneously effecting these two movements by a young child
playing with a container equipped with the safety closure cap of
the invention is minimal, so that a highly effective safety closure
is provided.
The cover cap is advantageously arranged on the screw cap so that
it can not be lost, for instance, by providing an inner annular rib
on the cover cap underlying a rim of the screw cap or protrusions
thereon so that direct access to the screw cap by pulling off the
cover cap is not possible.
Coupling of the cover cap with he screw cap by an axial movement of
the caps relative to each other can be effected in accordance with
the invention by complementary protrusions and depressions on the
caps which engage each other in response to axial displacement of
the cover cap with reference to the screw cap but are otherwise
disengaged so that the cover cap is freely turnable about the screw
cap.
To assure that the cover cap and the screw cap are normally not in
coupling engagement so that a turning of the cover cap does not
cause a corresponding turning of the screw cap and thus the
container closure can not be opened, it is provided according to a
further aspect of the invention that elastic members bias the cover
into the disengaged position and that only by overcoming the action
of these elastic members by axial pressure the cover cap can be
moved into the coupled position. Elastic members between the bottom
of the closure cap and the bottom of the screw cap may comprise
flexible ribs, for instance, in the form of slotted rings which are
integral with the cover cap and are faced by disc-shaped bosses on
the screw cap.
With a container closure cap according to the invention the actual
closure member as formed by the screw cap can be directly screwed
on external threads on the outside of the container such as the
neck of the container. According to a further embodiment of the
invention, which is of particular advantage, a base part is
provided which comprises an upper threaded part integral with a
receiving lower part. This lower part is fittable by means of an
annular groove on the rim of the container neck overlying the
same.
The invention also provides that the base part is rigidly but
detachably mounted on the neck of the container constituting part
thereof. The part has an external thread fitting the inner thread
of the screw cap. This has the advantage that by selecting a
suitable configuration of the base part the same screw cap can be
used for containers which are differently shaped, especially as to
the width of the neck.
The base part can be so arranged that it can be fitted into an
opening of a container wall such as the top and then constitutes a
neck for the same. Of course, the attachment of the base part to
the container must be such that the base part can not be turned as
otherwise the screwing off and on of the container closure by
moving the cover cap and the screw cap into the coupling position
and subsequent turning of both caps would not be effective.
To mount a container closure on a container which has already a
neck portion, it is advantageous when the base part comprises a
cylindrical threaded upper portion and a lower portion including an
annular groove which can be fitted upon the rim of the neck of the
container overlying the same.
The base part constitutes a substitute for the upper threaded
section on the neck of the container for screwing thereon the screw
cap and this has the advantage that the cover cap and the screw cap
do not have to be conformed to the dimensions of the neck of the
specific container but that such adaption of the specific dimension
can be effected by merely shaping the base part accordingly.
To effect a rigid and in particular not rotatable connection
between the receiving portion of the base part and the neck of a
container it is possible to provide at the lower rim of the
receiving portion, preferably on both sides in the ring-shaped
grooves radially engaging snap rings which engage corresponding
counter snap rings at the upper rim of the neck of the
container.
It is advantageous to provide for this purpose that an annular rib
on the inner wall of the ring-shaped groove engages an annular rib
protruding into the neck opening of the container while on the
oppositely disposed outer wall of the annular groove in the base
part protrusions are provided which can engage with grooves
provided on the upper rim of the neck of the container. The base
part preferably has a substantially h-shaped lengthwise
cross-section so that a configuration is possible in which the
outer diameter of the cover cap corresponds to the outer diameter
of the receiving portion of the base part.
To make it difficult for a child to open a container closure
according to the invention which has not been previously opened and
also to assure the user of the container that the same has not been
opened before, the container closure according to the invention can
be so arranged that the cover cap can be moved into the coupling
position only after tearing off a strip disposed between the
closure cap and the base part or neck of the container.
When the afore referred to base part has the substantially h-shaped
cross-section, the tear or pull strip is advantageously disposed
between the cover cap and the outwardly facing side of an annular
shank of the base part. This base part constitutes for all
practical purpose part of the container neck.
To prevent that the tear strip can be made ineffective by merely
bending it outwardly, the strip is preferably provided with
protrusions on its inner side which engage depressions in the
annular shank of the base part. With such arrangement, it is
assured that only by tearing off the strip the cover gap can be
moved into the coupling position with the screw cap. Hence, only
after removal of the strip opening of the container closure is
possible.
BRIEF DESCRIPTION OF THE INVENTION
Further advantages, features and details of the invention will
become apparent from the subsequent description of several
embodiments according to the invention.
In the drawings:
FIG. 1 is an elevational cross-section of the upper part of a
container having a neck portion seating a safety container closure
cap according to the invention on a greatly enlarged scale;
FIG. 2 is a section along Line II--II of FIG. 1 of the base part on
a reduced scale;
FIG. 3 is an elevational section of a further reduced view taken on
Line III--III of FIG. 2;
FIG. 4 is a perspective view of a cover cap with a tear-off strip
according to FIG. 1 as seen at a slant from below;
FIG. 5 is an axial cross-section of the cover cap according to FIG.
4;
FIG. 6 is a section taken on Line VI--VI of the cover cap according
to FIG. 5;
FIG. 7 is a perspective viewf the screw cap as used in FIG. 1;
and
FIGS. 8, 9, 10, 11, 12, 13, 14 and 15 are modifications of FIGS. 1
to 7 with respect to the cover cap and the screw cap associated
therewith.
FIG. 1 shows a container 1 upon the neck 2 of which a generally
tubular base part 3 is fitted. The upper cylindrical threaded
portion 4 of part 3 has screwed thereupon a screw cap 6 which is
overlapped by a cover cap 5. The base part 3 is further provided
with a lower receiving portion 7 which by means of an annular
groove 8 is clamped upon the rim neck 2. Part 3 serves for adaption
of screw caps 6 which have the same size to containers the necks 2
of which have different diameters. Obviously, it is easier and less
expensive to produce by injection molding of a suitable synthetic
plastic correctly dimensioned base parts than to provide, for
instance, screw caps 6 for each size of the neck diameter thereby
keeping low the inventory of screw caps 6. Each size of screw caps
also requires appropriately dimensioned cover caps 5. Moreover, it
is not necessary to provide on the outside of neck 2 threads for
screwing thereupon the screw caps 6.
The annular groove 8 of part 3 defines an inner annular wall 9 and
a concentric outer wall 10, the outer wall being longer than the
inner wall. Both these walls extend in axial direction and are
joined by a horizontally disposed base wall 11 thereby defining and
closing off the top side of the groove.
When the base part 3 is slipped on neck 2 of container 1, the neck
extends into groove 8 and abuts with its top rim 12 on the inside
of base wall 11. The inner ring wall 9 has at its lower end an
inwardly protruding bead 13 which is in engagement with a
peripheral rib 15 formed in the neck opening 14 near the upper rim
of neck 2. The inner surface of the outer wall 10 is formed with
protrusions 16 engageable with correspondingly shaped recesses 17
distributed over the circumference of the neck. The recesses 17 are
closed at the upper and the lower end by an annular rib 18. The
springy or elastic engagement of annular bead 13 of the base part
with the annular rib 15 on the neck and engagement of the
protrusions 16 in the depressions 17 of the neck effect a rigid
mounting of the base part to neck 2 as movement in axial direction
and in circumferential direction is prevented by wall 11 and
protrusions 16 respectively.
The screw cap 6 has on the inside of its bottom wall 19 an annular
rib 20 which serves to rigidify the bottom of the screw cap and
also to improve the sealing. The screw cap has further a threaded
side wall 24 which overlies the cylindrical upper threaded portion
4 of base part 3. A wall 21 of the screw cap has an inner thread 22
engaged with the outer thread of threaded upper portion 4 of base
part 3.
To effect coupling of cover cap 5 with screw cap 6, which is not
accessible from the outside, so that the screw cap can be turned
for screwing off and on cap 6 from portion 4 of base part 3, there
are provided on the screw cap at the lower end thereof outwardly
protruding ribs 24 forming a toothed ring and circumferentially
spaced grooves 25 on the outer edge of the screw cap bottom 19.
These ribs 24 and grooves 25 coact with the cover cap wall 26 by
means of inwardly protruding counter ribs 27 forming an inner ring
and also with corresponding counter ribs 29 disposed at a slant at
the edge between the cover cap wall 26 and the cover cap bottom 28.
To prevent a pulling off of the cover cap 5 in outward direction
from the screw cap the cover cap 6 is provided with an inner
annular rib 30 which underlies tooth-shaped ribs 24.
On the inside of the bottom 28 of the cover cap there are provided
flexible protrusions 31 forming slotted rings. Disc-shaped bosses
32 on the outside of the screw cap bottom 19 face protrusions 31
for coaction therewith.
Protrusions 31 retain the bottom 28 of the cover cap at a selected
distance from the bottom of the screw cap. As a result, the ribs 27
and 29 on the cover cap can be moved into the coupling position
with the detents on the screw cap as formed by ribs 24 and grooves
25 only by application of axial pressure upon the cover cap.
Prior to the first opening of the container, that is, when the
container is still in the condition in which it has been bought,
there is provided between the cover cap 5 and the ring-shaped
bottom or shank 11 of the base part 3 a tear-off strip 33 which
preferably has along its lower edge protrusions 34 engaging
depressions 35 in base part 3. To effect opening of the initially
positively locked container strip 33 which is joined by a narrow
bridge 36 to the cover cap is torn off by pulling a tab 37.
After removal of strip 33 the cover cap by an axial pressure
applied thereto can be pushed downwardly against the action of
elastic protrusions 31. As a result, the inner detents on the
closure cap engage with the respective detents of the screw cap. By
maintaining such axial pressure while turning the cover cap such
turning is transmitted to the screw cap 6 thereby opening the
container. It should be mentioned in this connection that it is of
course also possible and sufficient to use merely toothed rings
formed by the ribs and counter ribs 24 and 27 respectively for
coupling the cover cap 5 to the screw cap 6. Similarly, the ribs 29
on the cover cap and the groove 25 on the screw cap may be used to
effect coupling between the caps 5 and 6 by the afore described
axial displacement of the cover cap.
The base part 3, the screw cap 6 and the cover cap 5 are preferably
produced by ejection molding of a suitable conventional synthetic
plastic material while container 1 may be made of glass, synthetic
plastic or metal.
Striations, grooves or ribs 38 on the outside of cover cap wall 26
may be provided to prevent slipping of the hand of the user when
depressing and turning cover cap 5.
FIGS. 8 and 9 show an exemplification of a cover cap 5 and the
associated screw cap 6 respectively in which the elastic
protrusions 31 on the inside of the bottom 28 of the screw cap are
replaced by an annular rib 31' concentric with the wall 26 of the
cover cap. A single disc-shaped boss 32' is disposed opposite to
this annular rib on the outside of the bottom 19 of the screw
cap.
The slanted ribs 29 in the space between the cover cap wall 26 and
the bottom 29 of this cap nd the associated grooves 25 on the
circumference of the screw cap bottom 19 are disposed in the
embodiment according to FIGS. 8 and 9 in the same manner as in the
embodiment according to FIGS. 1 to 7. However, while the second row
of grooves and ribs in the arrangement according to FIGS. 1 to 7
are in form of complementary toothed rings, FIGS. 8 and 9 show
block-shaped ribs 24' on the outside of screw cap wall 21. These
ribs 24' coact with narrow ribs 27' on the inside of the cover cap
wall 26. These ribs 27' abut against the sides of ribs 24' in
response to an axial displacement of the cover cap relative to the
cover cap against the resilient action of the ring 31' so that a
turning of cover cap 5 is again transferred to screw cap 6.
The container closure according to the invention due to the
necessity of simultaneously applying axial pressure and rotational
force to the cover cap provides an effective safety factor against
opening of the container by a child as without the axial pressure
on the cover cap the same will idly turn on the screw cap, that is,
without transferring such turning to the screw cap. Moreover, if
only the axial pressure is applied to the cover cap without a
simultaneously rotary force the cover cap will immediately return
into the condition in which it is disengaged from the screw cap
where the pressure is released. In other words, it is assured that
during the entire opening operation the cover cap must be subjected
to both axial pressure and rotational force.
The embodiments according to FIGS. 10 to 15 are generally similar
to the embodiments of FIGS. 8 and 9 in that they comprise upper
ribs 29 on the inside of cover cap 9 and grooves 25 on the outside
of the bottom 19 of the screw cap which only after overcoming the
counter action of annular rib 31' can engage each other to couple
cover cap 5 and screw cap 6 for joint rotation. In addition, the
embodiments according to FIGS. 10 to 15 comprise on the outside of
the screw cap wall 21 and on the inside of cover cap wall 26,
coacting elements which engage each other without axial
displacement of the cover cap 5 toward the screw cap 6 when the
container closure is screwed on the container to effect a tight
sealing of the container. When the cover cap is turned in the
opposite direction, that is, in the direction for opening the
container closure, these elements slide past each other without
engagement.
The protrusions corresponding to the ribs 27' in FIG. 8 are
provided in the embodiment of FIG. 10 in the form of ribs 39 which
are tapered and undercut in circumferential direction to form
wedge-shaped tips 41. Ribs 40 on the screw cap are correspondingly
shaped in that they are also wedge-shaped in circumferential
direction. As shown in FIG. 11, the ribs 40 have moreover on the
most outwardly protruding side a wedge-shaped notch 42. In the
spaced-apart position of the caps as caused by the elastic annular
rib 31' shown in FIG. 10 the wedge-shaped tips 41 of ribs 39 can
engage the wedge-shaped notches 42 when the cover cap is turned in
clockwise direction for coupling the cover cap 5 and the screw cap
6 so that the container closure can be screwed tight without
requiring axial displacements of the cover cap 5 relative to the
screw cap 6 as it is required for the opening of the container
closure. In this manner, the more complex manipulation provided as
the safety feature is not needed for the closing of a container
closure. Such simplification is justified as the danger factor
resides in the opening of the container by a child rather than in
the closing thereof.
When the cover cap 5 according to FIG. 10 is turned relative to
screw cap 6 according to FIG. 11 in counterclockwise direction, the
protrusion 39 and 40 slide relative to each other without causing
turning of the screw cap. However, opening of the container closure
is possible only when the cover cap 5 is axially depressed
simultaneously with turning of the cover cap in counterclockwise
direction so that the ribs 29 engage the grooves 25 thereby
coupling the cover cap 5 and the screw cap 6 to each other.
In the embodiment of FIGS. 12 and 13 protrusions 29 on the cover
cap 5 are wider in axial direction than the corresponding
protrusions in FIG. 10. Moreover, they are not pointed or tapered
at the tip. The counter protrusions 40 on cover cap 6 according to
FIG. 13 also do not include the previously described wedge-shaped
grooves. The container closure according to FIGS. 12 and 13
otherwise functions in the same manner as the closure according to
FIGS. 10 and 11, that is, closing of the container is possible
without axial movement of cover cap 5 relative to cover cap 6.
However, opening of the container requires the axial displacement
of both caps simultaneously with the turning of cover cap 5 as a
safety feature to prevent opening of the closure by a child.
According to FIGS. 14 and 15, cover cap has radially protruding and
axially slanted ribs 43 and screw cap 6 has correspondingly shaped
and located coating ribs 44. Ribs 43 and 44 constitute incomplete
threads which effect coupling of the caps in response to a turning
in clockwise direction only for closing the closure while opening
requires a combined axial and rotational operation of the cover cap
as described.
The invention is not limited to the illustrated and described
embodiments. In addition to the various different arrangements of
the coacting grooves and protrusions for effecting coupling of the
cover cap 5 to the screw cap 6 as described and illustrated, it is
also possible to provide a decoupling position between the cover
cap and the screw cap so that for coupling the cover cap to the
screw cap the cover cap must be pulled upwardly relative to the
screw cap while the exemplified embodiments require an axial
depression of the cover cap.
It is also possible to provide a container closure according to the
invention in conjunction with a nozzle made of a suitable synthetic
plastic for a container that does not have a neck portion, that is,
of the kind shown in U.S. Pat. No. 3,388,842. Finally, it is also
possible as a simple solution of the inventive concept to provide a
counter thread for he screw cap 6 directly on the outside of the
neck of a container in which case the base part 3 is eliminated.
Moreover, the term "screw cap" is not limited to caps having
internal thread engageable with external threads on the base part
or the neck itself but is intended to encompass also caps that are
attachable by other types of rotary fastening means such as a
bayonnet lock.
* * * * *